#pragma once
#ifndef __NO2_H__
#define __NO2_H__

double _jia(double,double);
double _jian(double, double);
double _chen(double, double);
double _chu(double, double);
struct data _input();
struct data _input2(struct data);
int _print(struct data);
struct data _xuan(struct data);
int _pan();

#endif // !__NO2_h__
